661327 has 2 divisors, whose sum is σ = 661328. Its totient is φ = 661326.

The previous prime is 661321. The next prime is 661343. The reversal of 661327 is 723166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661327 - 2¹¹ = 659279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330663 + 330664.

It is an arithmetic number, because the mean of its divisors is an integer number (330664).

2⁶⁶¹³²⁷ is an apocalyptic number.

661327 is a deficient number, since it is larger than the sum of its proper divisors (1).

661327 is an equidigital number, since it uses as much as digits as its factorization.

661327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 661327 is about 813.2201423969. The cubic root of 661327 is about 87.1241895745.

The spelling of 661327 in words is "six hundred sixty-one thousand, three hundred twenty-seven".